package com.atguigu.stack;

import com.atguigu.array.Array;

public class StackArray<E> implements Stack<E> {
    private Array<E> array;
    public StackArray(int capacity){
        array = new Array<>(capacity);
    }
    public StackArray(){
        array=new Array<>();
    }
    @Override
    public int getSize() {
        return array.getSize();
    }

    @Override
    public boolean isEmpty() {
        return array.isEmpty();
    }

    @Override
    public void push(E e) {
        array.addLast(e);
    }

    @Override
    public E pop() {
        return array.removeLast();
    }

    @Override
    public E peek() {
        return array.getLast();
    }

    @Override
    public String toString() {
        StringBuilder res = new StringBuilder();
        res.append("Stack：[");
        for(int i = 0 ; i < array.getSize() ;i++){
            res.append(array.get(i));
            if(i != array.getSize()-1){
                res.append("，");
            }
        }
        res.append("] top");
        return res.toString();
    }
}
